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<br />apipec;apablectpassi!l<Jma.;arfloods. Truckelovation5 are sutfi- <br />cient to ~CQ;l tr,eM aSoyo the elevdtion at '~n.. b"c~,,~-u~ f lo'~s at a <br />STiJndilrdPrajectFload. <br />7r() ~"iO h 19"~~y br 1'"'1Q5 t"at eraS; Gran"o Ka II CrEek are <br />located o~ Riverdale Roao and Coiorado ~oJlevarc. Tho bric~o On <br />,-liYcrd~le Ro~~ '~oul" ha'Jc it~ d()ck overtopppc by at le~st 11 half i! <br />tOOT by tr.e I ntflrmec'iate Ikgionc I F loo~. f.,;Jp:"oaches to tl'e I!r i dge <br />'",'J'Jldbe Inun<1ntndbys""I<lllerti:xJCs. ThebridgeonColorado <br />Jou levar~ an~ I ts ~pproaches are e lev~ted aboYl' the ieye I of a Stard- <br />dr~ Pruject Flood. <br />ene br i dgo I ocated o~ the Sout~ For~ ot Grange ~a I I <br />Creek Is in the s~udy re~c~. This orljge i~ located on Eest 104th <br />Ayenue, but sutfi ciont dat~ wore not ava i I"b Ie to compare flood <br />heights to deck olcv~tions. The water surface elovations for the <br />intermediate Regional and Stonda~d Project Floods On Last I04th Avenue <br />dre shown on thu stre~m ~rot lies. <br /> <br />to the lands lmff~diately downstream, but could not contain the Inter- <br />med lato Rog lonal and Standard Project Floods. Tile rai I~oad &J11bank~ <br />ment provides Incidental flood benefits to downstream landS through <br />discharge control exorci~ed by the pi pe. <br /> <br />O~structlon5 to Flood Flow <br />The m~jor ohs~ruction to t low on Grange Ho II Crnek is <br />t~l' union Pacltic R~ilro~~ "",I>dflkll,('nt, w'licn rises 40 ffle1 ':'U("-Ie a <br />?-foot dia~e~er multi-rl~te ~I~e. The pipe can pass tl~s approach- <br />ir"KJ Int"wm..didt'cl Il""ivrlal flOOd "'gnituje. :Jre~tcr tloods would <br />Cdu~e censl :kr<l~le baCkw"ter as sho~'n On th{> profi leS of th" I nt"r- <br />..,,,~ i ate '<(ljJ 10"" I "nd S-tdn(!d~d Project Floods. 5e", Section 7, P lilte <br />17. [Jacked~up flows wo'.J Id extend across the diu ide ne~r the r~ i 1- <br />rrmn into t~" North Fork watcrslHln. <br />OtMer o~structlons are +r,,, ~ridge5 "nd structure;. <br />located on the South Fork Up5t~oil" of East IOl.th Avenue. Head lo~ses <br />through tho b~ idges were computed by tho method deseri bed in <br />'l-iydrcl\J I ics of Ori d~cl '''Jtcn.<lY~,'' by the Diu Islon ot Hydra" I ie <br />{esearch, Bu reilu ot Pub I I c : ~oacJ 5 , I qhD . r "" road "Mba n kme nt s we re <br />con5ldor..d as I!ro.,d-crested weirs. Tho r"servol r5 On t~e South F[')r~ <br />or :;range 1;"11 Cn,ek would providQ SOl,""-' iflCld.",ldl /IQ\>J protectl,m <br /> <br />I.:) <br /> <br />4J <br />